Hook



June 24 M. J; KEARNS HOOK Filed March -27. 1923 2 Sheets-Sheet l Ill M. J KEARNS HOOK jaw 24, n4. 1,498,691

Filed March 27. 1923 2 Sheets-Sheet 2 Patented June 24, 1924.

MICHAEL JOSEPH KEARNS, OF

TI'IUSVILLE, rnnnsynva vn Application filed. March 27,

T 0 all whom "it may concern:

Be it known that 1, MICHAEL J. KnAnNs, a citizen of the Dominion of Canada, residing at T itusville, in the county of Crawford and State of Pennsylvania, have invented certain new and useful Improvements in Hooks, of which the following is a specification.

In carrying out the present invention, it is my purpose to provide a hook, that is primarily, but not specifically adapted for oil well work, such as the lifting of the casing from the well, or in rotary drilling.

A further purpose of my invention is the provision of such a hook, wherein a desirable number of lengths of the casing may be lifted, and then screwed from the casing within the well whereby without starting the machinery, the device is well adapted for lifting the lengths of easing an additional distance, for preventing or overcoming the usual tearing off of the threads of the casing sections.

The nature and advantages of the inven tion will be better understood when the fol lowing detailed description is read in connection with the accompanying drawings, the invention residing in the construction, combination, and arrangement of parts as claimed. 1'

In the drawings forming part of this application, like numerals of reference indicate similar parts in the several views, and wherein Figure 1 is a front elevation of my improved hook.

' Figure 2 is a. side elevation thereof.

Figure 3 is a detail vertical cross sectional view, and

Figure 1 is a detail transverse section upon the line 4.4 of Figure 1.

Referring to the drawings in detail, my article comprises a main bodyportion designated generally by the numeral 5, and a hook element designated 6. The body 5 constitutes an open ended cylindrical casing 7 externally screw threaded at its opposite ends. Upon the lower end of the said casing is a screw threaded cap 8, while upon the upper screw threaded end is a head 9.

The casing 7 is vertically slotted at 10 upon opposite sides thereof for purposes hereinafter described. Movable within the said casing 7 is what is hereinafter termed a cross head 11, the same including a vertical pin or rod 12, as well as side arms 13, which 192-3. Serial No. 627,981.

engage outwardly of the said slots 10 within the casing. The said head 9 is provided with a socket let in alinement with thepin 12, and adapted for receiving the upper end; of this pin when the cross head is moved upwardly within the casing. As a means for normally forcing the cross head downwardly within the casing, there is provided a relatively strong expansion spring 15, the same encircling the pin 12, and engaging at its opposite ends with the head 9, and main portion of the cross head 11. Loosely,'pivotally connected to the ends of the said arms 13 of the cross head 11 are the ends of a bail member 16, to the upper end of which is secured the usual hoistin cable. WVithin the lower end of the casing? and supported upon the end cap 8 is a desirable form of roller bearing 17. The shank 6 of the hook element 6 extends upwardly within the lower end of the casing, through an opening within the end cap 8, it being noted that the extreme upper end of this shank portion is screw threaded for receiving a round nut 18, the same having face to face contact with the top surface of the said roller bearing 17. This specific connection between the casing and hook element 6 permits of a free swivel movement of the hook upon the main body portion 5 when the device is used in rotary drilling or the like.

The end cap 8 is keyed upon the casing 7, through the medium of a set screw 19, while this cap is provided with a drain plug 20, for permitting the discharge of grease, oil and dirt from the bearing 17. Whenever it is desired to rigidly connect the hook element 6 to the main body portion 5, a relatively elongated bolt 21 is extended through alined openings within the opposite sides of the rounded nut 18 and an opening within the shank 6 of the hook element 6.

The hook element 6 is provided with a clevis 23, for permitting of the pulling of the hook into the required position,-while the same is also provided with a clevis 24, for overcoming any liability of the load or the article being lifted from jumping off of said hook.

In view of the above description, it will at once be apparent that the device may not only be used for lifting well casin s, but may also be employed in rotary dril ing, it being noted that when the device is employed for lifting well casings, the head 11 will be up within the casing 7 against'the of the casing sections.

action of the spring 15, and when a certain number of the sections of the well casing have been unscrewed the tension of this spring will draw the hook element 6 upwardly for consequently raising these sections a slight distance further, which Will effectively prevent tearing oil of the threads Although I have herein shown and described the preferred embodiment of the present invention, it is nevertheless to be understood that minor changes may be made therein, without departing from the spirit and scope of the invention claimed.

Having thus described my invention, what I claim as new, and desire to secure by Letters-Patent is 1' A hook structure comprising a cylindrical casing provided at its opposite sides with slots, a head closing the upper end of the casing and provided with a centrally disposed interiorly located socket, a cross eeaeei anti-friction bearing structure interposed between the upper end of the shank of the hook and the lower end of the casing, and housed within the casing, a rod mounted upon the intermediate portion of the cross head and having its upper end slidably received in the socket of the head member and ,a spring interposed between the head member and the cross head and serving to hold the cross head disposed toward the shank of the hook.

In testimony whereof I affix my signature.

MICHAEL JOSEPH KEARNS. 

